64915968 has 80 divisors (see below), whose sum is σ = 186300576. Its totient is φ = 19968000.

The previous prime is 64915909. The next prime is 64915987. The reversal of 64915968 is 86951946.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18343 + ... + 21593.

Almost surely, 2^64915968 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64915968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93150288).

64915968 is an abundant number, since it is smaller than the sum of its proper divisors (121384608).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64915968 is a wasteful number, since it uses less digits than its factorization.

64915968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3285 (or 3269 counting only the distinct ones).

The product of its digits is 466560, while the sum is 48.

The square root of 64915968 is about 8057.0446194619. The cubic root of 64915968 is about 401.8992346636.

The spelling of 64915968 in words is "sixty-four million, nine hundred fifteen thousand, nine hundred sixty-eight".